boland



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, J. W. BOLAND.

Gas Making Apparatus.

No. 238,837. Y Patented March 15.18s|.'

N. PERS. PHOTD-UTHOGRAPHER. WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

JOHN` BOLAND, OF BALTIMORE, MARYLAND.

GAS-MAKING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 238,837, dated March15, 1881.

Application filed July 28, 1880. (No model.)

To all whom it maylconceru:

Be it known that I, JOHN W. BoLAND, of the city of Baltimore and Stateof Maryland, have invented certain Improvements in Gas- MakingApparatus, of which the following is a specication; and I do herebydeclare that in the same is contained a full, clear, and exactdescription ot' my said invention, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

This invention relates to certain improvements in the hydraulic main,whereby the tar which accumulates in the same is automatically carriedoft without varying the depth of water in the main, which effects thesealing of the dip-pipes.

In carrying out my invention I provide the head of the hydraulic mainwith a box divided into two compartments, which are in communicationwith the interior of the main by means of separate apertures. One of thecompartments receives water only from the main, the aperture connectingthis compartment with the said main being situated above the maximumheight of the tar. The other compartment receives tar from the main, andthe vertical position of its commnnicatin g aperture lixes the maximumheight of tar in the main.

The water and tar chambers are each provided with an overflow-opening,the practical f the box B for the gates, and the said spaces height ofwhich is regulated by an adjustable gate.

The flow of tar independently of the water is effected by depressing thetar-gate to a point slightly below the level ot' the water in thewaterchamber, or to a point which will give to the tar, which is theheavier body, a weight only equal to that of the water. By this means anequilibrium in weight of the two bodies is obtained, notwithstanding thedifference in their specific gravity. Consequently, upon the deposit oftar from the dip- Figure I is a longitudinal section of the iml provedhydraulic main. Fig. II is a cross-section of Fig. I, taken on thedotted line x y.

Similar letters of reference indicate similar parts in both the views.

A is the hydraulic main, having the head a and the usual dip-pipes, oneof whichis shown in the drawings and designated by l).

B is the overflow-box projecting from the head a. The box B is dividedbythe partition o into the water and tar chambers, respectivelyrepresented byO andl). rIhe water and tar chambers are in communicationwith the interior of the main by means of apertures d and e, relativelyarranged as shown. The tar-aperture e, which is for the admission of tarfrom the main to the tar-chamber, commences on a line corresponding withthe bottom of the main and extends upward a distance equal to t-he depthto which the tar is to be maintained. y The water-aperture d is situatedabove the tar-line,and may be of any convenient size.

E and F are respectively the water and the tar gates, and they ar'eoperated by means of screw-stems, as shown.

Suitable spaces, G and H, are provided in have nozzles f and g, to whichpipes may be attached to carry oli' surplus water and tar.

Supposing the water and tar gates to be set as shown in lthe drawingsand the main to cont-ain water only, tar dripping from the dippipesaccumulates in the bottom of the main until it rises to the top of theaperture e, the water displaced by the tar passing oft' over thetar-gate. After this the tar rises only in the tar-chamber and until itreaches the upper edge of the tar-gate, when it overliows and passes oftthrough the tar-nozzle g.

It will be understood that the overilow ot' the tar, as described',depends upon the upper edge of the tar-gate being maintained below theWater-line, so as to compensate for the shown, and provided withsuitable overflowgreater specific gravity of the tar and equalopeningsand vertically-adjustable gates,sub 1o ize the weight of the respectivecolumns. stantially as and for the purpose herein speci- I claim as myinventioned. 5 In combination with ahydraulic main, atar JOHN W. BOLAND.

and. a Water overflow chamber having aper- Witnesses: turescommunicating with the interior of the WM. T. HOWARD7 Said main,situated at dierent heights, as J NO. T. MADDOX.

